You haven't said, but did you contact them directly to ask after the part? Ask if they can provide it to you. And if not, can they suggest a parts seller. And ask if they can provide the correct part number so you can order it from a dealer.
KZ svc had emailed me in return, They only sell just the pedal unit. No individual parts.
It's just a bad (broken) spring. I'll see if I can find a hardware store that has something that works. Customer won't go for replacing the whole foot pedal unit.
Does the customer use the sostenuto pedal? Many people don't. If that is not the broken one, perhaps steal its spring for the broken one. At least he'd have his pedal to use while you look for a proper spring.
Got a piano store nearby or a piano tuner/restorer? perhaps they might have something.
And I have no idea how it is made, but might the similar pedals on a Roland or Yamaha have springs that could be made to work?
Education is what you're left with after you have forgotten what you have learned.
You haven't posted a description or a picture.
Go here & have a look around.:McMaster-Carr
Found one today at the hardware store. Used for lawnmower but the tension was just about right and it was close to the diameter needed but I modified the top side to fit the spring rest bump in the pedal.
Cust was happy. $1.25 vs $147 part.
I know I have been able to get Roland parts for uprights, but Kz is insane wanting $150 for this.
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